They used to work good 5 to 7 years ago, but now it's nothing special any more.

You should use HQ backlinks instead, increase your social signals and have a look at your on-page SEO techniques.

Hey SEO GURUS can you tell to everyone which sort of backlinks have value in 2015 ?

PBN and SAPE work wonders like they always have.

But before linking to your PBN, sape link do you build manual backlinks ?

PBN and SAPE are "manual" backlinks. This is what works and ranks things. You can use other types of links to diversify anchors for example, but PBN/SAPE are what gives you power.
Also, for other types of links who cares if they are manual or automated, they are still same links, you can't tell a difference.